/*!
 * Crypto-JS v1.1.0
 * http://code.google.com/p/crypto-js/
 * Copyright (c) 2009, Jeff Mott. All rights reserved.
 * http://code.google.com/p/crypto-js/wiki/License
 */

const Crypto = require('./crypto.js');

(function(){

// Shortcut
var util = Crypto.util;

// Public API
var SHA1 = Crypto.SHA1 = function (message, options) {
    var digestbytes = util.wordsToBytes(SHA1._sha1(message));
    return options && options.asBytes ? digestbytes :
           options && options.asString ? util.bytesToString(digestbytes) :
           util.bytesToHex(digestbytes);
};

// The core
SHA1._sha1 = function (message) {

    var m  = util.stringToWords(message),
        l  = message.length * 8,
        w  =  [],
        H0 =  1732584193,
        H1 = -271733879,
        H2 = -1732584194,
        H3 =  271733878,
        H4 = -1009589776;

    // Padding
    m[l >> 5] |= 0x80 << (24 - l % 32);
    m[((l + 64 >>> 9) << 4) + 15] = l;

    for (var i = 0; i < m.length; i += 16) {

        var a = H0,
            b = H1,
            c = H2,
            d = H3,
            e = H4;

        for (var j = 0; j < 80; j++) {

            if (j < 16) w[j] = m[i + j];
            else {
                var n = w[j-3] ^ w[j-8] ^ w[j-14] ^ w[j-16];
                w[j] = (n << 1) | (n >>> 31);
            }

            var t = ((H0 << 5) | (H0 >>> 27)) + H4 + (w[j] >>> 0) + (
                     j < 20 ? (H1 & H2 | ~H1 & H3) + 1518500249 :
                     j < 40 ? (H1 ^ H2 ^ H3) + 1859775393 :
                     j < 60 ? (H1 & H2 | H1 & H3 | H2 & H3) - 1894007588 :
                              (H1 ^ H2 ^ H3) - 899497514);

            H4 =  H3;
            H3 =  H2;
            H2 = (H1 << 30) | (H1 >>> 2);
            H1 =  H0;
            H0 =  t;

        }

        H0 += a;
        H1 += b;
        H2 += c;
        H3 += d;
        H4 += e;

    }

    return [H0, H1, H2, H3, H4];

};

// Package private blocksize
SHA1._blocksize = 16;

})();

module.exports = Crypto;